Murphy's day 

Based on Murphy's law, which posited ""Anything that can go wrong will go wrong". A day in which everything is messed up.

-Hey Peter, what's up with you.
- Oh, man. Today was a Murphy's day from start to finish. I missed the bus, was late for work and got suspended.

Murphy's day by Skr! September 30, 2011

St. Totteringham's Day 

St. Totteringham's Day is the day celebrated by Arsenal F.C. fans when Tottenham Hotspur can no longer finish above Arsenal F.C. in the English Football League by virtue of not being able to catch their rivals, even if they win every remaining game.

Due to its very nature, St Totteringham's Day is moveable and can occur at varying times during the season based on the respective fortunes of Tottenham Hotspur and Arsenal F.C..

In 2007 it is anticipated that St. Totteringham's Day will fall on Saturday 21st April when Arsenal F.C. travel to White Hart Lane; home of the Tottenham Hotspurds.

St. Totteringham's Day by Makams December 25, 2008

National Bf Day

a day on october 5th where yu spoil yo nigga and buy him sum rich nigga shit ya dig🤝

“happy national bf day daddy”
“stfu bitch”

National Bf Day by Slave Slapper October 4, 2021

Homestuck Day 

A worldwide fan celebration day happening on April 13th, also known as 413 or HSDay. Is the conmemoration of the day on which Adrew Hussie, creator of Homestuck , posted the first page of the webcomic on MSPaintAdventures in 2009. The day is known by Homestuck fans as the day on which, if you are a homestucker (strong follower of the comic), you have to cosplay and talk about Homestuck as much as possible. This means going outdoors, or to fan conventions, reunions which usually concludes with a massive internet traffic consumption, mostly on tumblr.

It has to be added that some fans might celebrate HSDay on a random day for no reason.

Example 1
Hey, tomorrow is March 14th, it's Homestuck Day.

Great, I'm going to start working on my Karkat cosplay.

Example 2
There's a lot of new Homestuck posts on tumblr.

Must be Homestuck Day.

Homestuck Day by zariyda August 31, 2013

all day i dream about sport 

The slogan 'all day i dream about sport' 1981-2017 was created by Barbara Gauss, Germany.

In her eBOOK 'all day i dream about sport' she talks about her life, the way she grew up, the dreams she had as a child and young grown up and the struggle she is going thru today, while defending her rights as a trademark owner, creator and sole owner of the intellectual property worldwide of the following slogans:

'all day i dream about soccer'
'all day i dream about sports'
'all day i dream about sport'

See also 'sports'

'all day I dream about sport' is what ment everything to me when I was small and is what I feel, if I had to describe my childhood.

all day i dream about sport by Barbara Gauss October 31, 2005

Second Day Stupids 

The feeling one gets the day after smoking marijunana. This person is slower than normal and seems a little dumber than usual.

Joe:"Does Will seem a little more stupid today?"
Steve:"Yah man he must have second day stupids."

Second Day Stupids by Cincinatus April 12, 2008

National Chicken Day 

A day when we honor chicken, known on July 9th. Meat-eaters celebrate by eating chicken, and vegetarians celebrate by protesting the use of chicken as food. Farmers tend to celebrate by overfeeding their chickens.

Family Guy displays an unappropriated direction of National Chicken Day.

National Chicken Day by TwitchyTeh1337 August 1, 2008